1. Los Angeles, California
PDR Presentation
Los Angeles, California
Architectural Engineer – Marc Sciarrino
Foundation Engineer – Marc Sciarrino
Structural Engineer – Scott Mason
Fluids System Engineer – Matt Owens
Building Thermal Engineer – Tim Christo
Solar Thermal Engineer – Andrew Baglio

2. PDR Agenda Introduction Floor Plan Layout House Elevation Drawing
Foundation Analysis
Roof Truss Analysis
Hydronic Subsystem Analysis
Building Thermal Analysis
Solar Thermal Analysis

3. Floor Plan Layout
1st Floor

4. Floor Plan Layout
2nd Floor

5. House Elevation Drawing

6. Foundations Analysis Important Information:
Soil Type : Silty Clay Loam
Dry Soil Density : lb/in3
Frost Line: Approx. 12in
Frost Period: days
Water table: > 80in below surface
Assumptions:
The weight of concrete ≈ 145 lb/ft3
The weight of a house ≈ 1000 lb/ft2
Allowable Bearing pressure on soil from the footer = 150kPa ≈ 3135 lb/ft2

7. Foundations Analysis Calculations WHouse = 3060000 lb
WSlab = lb
Amount of Footer Needed ≈ 1025ft2

8. Structural Analysis Two common residential truss types
Fink: Cheap, Common
Howe: Also common, stronger
Images from

9. Structural Analysis Truss Design Factors 6 in 12 roof (26.5°)
Asphalt Shingles
Douglas Fir Maximum Stress=1700psi in compression, 1668psi in shear
Pine Maximum Stress=1200psi in compression, 1438psi in shear
Roofing Material weight=4.4lb/sq. Ft
85lb Flat Plate Collectors
2' Truss Spacing
Information from engineeringtoolbox.com

10. Structural Analysis Truss Analysis Maximum Stress=415.32psi
Minimum Factor of Safety=4.09

11. Structural Analysis Recommendation: Use Fink type truss
2x8 top rafters, 2x4 supports, and 2x8 joist
Consider pre-made truss from company such as Stone Truss Company

12. Hydronic System Design
Basic closed loop system with water as working fluid
Advantages
Easy to install
Low maintenance
Efficient heat transfer
Less dense working fluid
Less heat loss
Cheaper
Disadvantages
Corrosion
Needs filtration
KEY
A - 5 flat plate collectors
B - Hot water from collectors
C - Pump
D - Controller
E - Storage Tank w/ heat exchanger
F - Incoming cold water
Reference:

13. Head Loss Analysis Assumptions Results 5 plat plate colletors
Section
Flow Rate
Pipe Diameter
Velocity
Friction Head Loss
Pipe Length
# of Equivalent Elbows
Equiv. Length per elbow
Total Equiv Pipe Length of Elbows
Total Equiv. Pipe Length
Pipe Losses
Change in Elevation
Other Losses
Total Losses
Cumul. Head
(gpm)
(inches)
(ft/sec)
(ft head /100 ft of pipe)
(ft of pipe)
(#)
(ft of pipe /elbow)
(ft head)
(ft)
Pump
12.50
1.50
2.20
1.00
0.00
4.00
0.02
Control Valve
10.00
2.00
8.00
18.00
0.27
0.29
Riser Pipe
26.00
0.39
18.39
18.68
Collector Inlet Pipe
5.00
13.00
0.20
18.87
Flate Plate Collector
2.50
5.77
13.77
32.64
Reverse Return Pipe
25.00
16.00
41.00
0.62
33.26
Roof Pitch Pipe
12.00
0.18
-8.00
-7.82
25.44
Drop Pipe
22.00
0.33
-18.00
-17.67
7.77
Isolation Valve
7.78
Heat Exchanger
9.00
0.14
8.20
8.34
16.12
16.13
Assumptions
5 plat plate colletors
2.5 gpm flow rate through FPCs
8.2 ft of head loss through heat exchanger
Results
Max head = ft.

14. Pump Selection Must overcome max head of 33.26 ft.
Grundfos UP series Performance Curves
(2)
Must overcome max head of ft.
Must provide flow rate of 12.5 gpm.
Select either UP 26-96F or UP 26-64F
Put two pumps in series to overcome max head
Pumps in Series
(1)
References: (1) Sykes Innovative Solutions
(2)

15. Storage Tank 120 gallon tank Painted steel exterior Glass lined
Cheaper
Cobalt enriched lining
Prolonged life
Greater durability
Expensive
Foam insulation with R=19
Internal heat exchanger
Reference: SunMaxx Solar

16. Plumbing PEX Copper Less leaks Flexible No knocking Less fittings
Shut-off valves at each supply line
Can’t be used outside
Can’t be recycled
Cheaper
Corrosion
Develops leaks
Knocking
Weather resistant
Bacteria resistant
Unaffected by UV rays
Recyclable
Expensive
Reference:

17. Window & Door Placement: 1st Floor
Doors

18. Window & Door Placement: 2nd Floor

19. Wall Cross Section Gypsum (t = ½”, 4’ x 10’, $8.55)
Studs (t = 5.5”, 2” x 6” x 8’, $3.43)
Insulation
t = 5.5”, 5.5” x 15” x 93”, R = 21, $44.75
t = 5.5”, 5.5” x 23” x 93”, R = 21, $58.82
Stud
Gypsum
Siding
Lowes
Plywood
Insulation

20. Wall Cross Section Plywood (t = 15/32”, 15/32”x4’x8’, $12.47)
Siding (t=.042”,12.5’x8”.042”,$128/24 pieces)
Stud
Gypsum
Home Depot
Siding
Lowes
Plywood
Insulation

21. Windows & Doors Windows (31.25” x 49.25”, U = .3, $164)
Front Door (36” x 80”, U = .23, $329)
Back Door (72” x 80”, U = .29, $676)
Side Door (36” x 80”, U = .15, $139)
Home Depot

22. Assumptions Roof R-value is 38. Installation costs are not included.
Worst case scenario: Tsummer = 105 °F, Twinter = 25 °F, Tinside = 70 °F.

23. Design Analysis West Wall: Wall Length (ft): 30 Wall Height (ft): 18
# of Windows: 2
# of Doors: 1
Total area (ft^2):
540
Window Area (ft^2):
Door Area (ft^2): 20
Stud Area (ft^2):
Insulation Area (ft^2):
fraction area of windows:
fraction area of doors:
fraction area of studs:
fraction area of Insulation:
Stud U-value (Btu/(h*ft^2*F)):
Insulation U-value (Btu/(h*ft^2*F)):
Window U-value (Btu/(h*ft^2*F)):
0.3
Door U-value (Btu/(h*ft^2*F)):
0.15
Total U-Value (Btu/(h*ft^2*F)):

24. Design Analysis 15” Insulation 23” Insulation UA = 315.14 Btu/(h*F)
QS = Btu/h
QW = Btu/h
P = $ 27,097.87
UA = Btu/(h*F)
QS = -10,730.6 Btu/h
QW = 13,796.5 Btu/h
P = $ 22,117.87

25. Flat Plate Collectors 5 Collectors Sol 25 Plus

26. F-Chart Water Storage House Heating System
Location LA CROSSE MUNICIPAL ARPT WI
Water volume / collector area 2.20 gallons/ft^2
Building UA (0 if only DHW) 321 Btu/hr-F
Fuel Gas
Efficiency of fuel usage %
Domestic hot water) Yes
Daily hot water usage gallons
Water set temperature F
Environmental temperature 68.0 F
UA of auxiliary storage tank 3.12 Btu/hr-F
Pipe heat loss No
Relative load heat exchanger size 1.00
Collector-store heat exchanger No
Flat-Plate Collector
Number of collector panels 5
Collector panel area ft^2
FR*UL (Test slope) Btu/hr-ft^2-F
FR*TAU*ALPHA (Test intercept) 0.660
Collector slope 47 degrees
Collector azimuth (South=0) 0 degrees
Incidence angle modifier calculation Glazings
Number of glass covers 1
Collector flowrate/area lb/hr-ft^2
Collector fluid specific heat 1.00 Btu/lb-F
Modify test values No

27. Economics Cost per unit area 35 $/ft^2 Area independent cost 2000.00 $
Price of natural gas $/100ft^3
Annual % increase in natural gas %
Period of economic analysis 30 years
% Down payment 100 %
Annual mortgage interest rate 6.0 %
Term of mortgage 30 years
Annual market discount rate 4.0 %
% Extra insur. and maint. in year %
Annual % increase in insur. and maint. 8.0 %
Eff Fed.+State income tax rate 30.0 %
True % property tax rate 1.5 %
Annual % increase in property tax 2.5 %
% Resale value %
% Credit rate in tier %
Maximum investment in tier
tax credits
cost of nat gas

28. Questions?